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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '467e07c41e75608690b8961b23f6866a176b03298e433c683febaca10c9731fb' 
  AND token = 'Wx4MNiTWT+f/cqzxmK/AVSKFb0AJ+44NhPhketbZhEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}